MacOS 12 ("Monterey") End of Support

MacOS 12 ("Monterey") reached end of life according to this - https://endoflife.date/macos
Also, MacOS 12 ("Monterey") received [last update on July 29, 2024](https://en.wikipedia.org/wiki/MacOS_Monterey). Mac official [one ](https://support.apple.com/en-us/106339)

This issue is created to track progress to remove support for MacOS 12 ("Monterey") from .NET 6.0 and .NET 8.0.

### Repos team to update:

- [ ] Remove installers for the outdated distro
- [ ] Remove build support
- [ ] Remove test assets

### Infrastructure Team Accountabilities/Deliverables:

- [ ] Notification to NetCore Engineering Partners
- [ ] Remove the outdated version from the hardware pool

### Release Team

- [ ] Send Notification to every team in .NET for upcoming addition
- [ ] Supported OS content gets updated on GitHub and marketing sites.
- [ ] Update release manifest files.
- [ ] Docker files which are used for install testing needs to be updated.

### Document updates:
- [ ] Add/Remove OS prerequisites to the dependencies document
- [x] Update distro install page